/**
 * Copyright : http://www.orientpay.com , 2007-2012
 * Project : oecs-g2-utility-trunk
 * $Id$
 * $Revision$
 * Last Changed by jason at 2011-9-13 下午4:53:38
 * $URL$
 * 
 * Change Log
 * Author      Change Date    Comments
 *-------------------------------------------------------------
 * jason     2011-9-13        Initailized
 */

package com.zz.bsp.util;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


/**
 * 以静态变量保存Spring ApplicationContext, 
 * 可在任何代码任何地方任何时候中取出ApplicaitonContext.
 * 
 */
public class SpringContextUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextUtils.applicationContext = applicationContext; //NOSONAR
    }

    public static void init(ApplicationContext applicationContext){
        SpringContextUtils.applicationContext = applicationContext;
    }
    
    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        checkApplicationContext();
        return applicationContext;
    }

    /**
     * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        checkApplicationContext();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
     * 如果有多个Bean符合Class, 取出第一个.
     */
    public static <T> T getBean(Class<T> requiredType) {
        checkApplicationContext();
        return applicationContext.getBean(requiredType);
    }

    /**
     * 清除applicationContext静态变量.
     */
    public static void cleanApplicationContext() {
        applicationContext = null;
    }

    private static void checkApplicationContext() {
        if (applicationContext == null) {
            throw new IllegalStateException("applicaitonContext is not init!");
        }
    }
}
